There are few threads here about added insulation (Best practices for thermal insulation? Maximum chamber temperature?, note sublinks) or additional chamber heaters (Actively heated chamber, Adding simple chamber heater to X1C).
I myself found it sufficient to just put a dense cardigan over the printer (without blocking the rear though). I was always with the printer when I did that though. For safeties sake.
Nowadays, I have a Plus 4 with its heated chamber. Even prints PPS-CF very nicely. But PA6-CF still has better layer adhesion and is a lot cheaper.